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The Mars Odyssey was launched April 7, 2001. After a six-month journey, the Odyssey arrived at Mars on October 24, 2001. The instruments onboard the Mars Odyssey will study the minerals on the surface...more

Aerobraking slowed the Mars Global Surveyor down when it reached Mars. Aerobraking also helped MGS to get into the right orbit for mapping the surface of Mars. Aerobraking means that the MGS flew through...more

Mars Global Surveyor carries an instrument which measures the heights of things. This instrument is called an altimeter, or "altitude-meter". The graph to the left shows the results returned from Mars...more

Mars Global Surveyor carries an instrument which measures the heights of things. The picture to the left shows Mars Global Surveyor's measurement of the size of the giant cliff which separates the southern...more

Mars Global Surveyor carries an instrument which measures the heights of things. The picture to the left shows the results returned from Mars Global Surveyor's measurement of the size of some of the Martian...more

It has been more than 30 years since America's first missions to Mars. Here are some of the instruments carried by the Mars Global Surveyor (called MGS for short). These instruments are designed to study...more